Improvement in saw-mills



2 Sheets -Sheet I.

N. JOH N SON.

improvement in Circular Saw-NiiHs. N0 127 062 Patented'May 21,1872.

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tached views UNITED STATES NELSON JOHNSON, OF JASPER, NEW YORK.

IMPROVEMENT IN SAW-MILLS.

To all to whom it may concern:

Be it known that I, NELsoN JOHNSON, of J asper,yin the county of Steuben and in the State of New York, have invented certain new and useful Improvements in Saw-Mills; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon making a part of this specification.

The nature of my invention consists in the construction and arrangement of the setworks for a saw-mill, as will be hereinafter more fully set forth.

order to enable others skilled in the art to which my invention appertains to make and use thesame, I will now proceed to describe its construction and operation,referrin g to the annexed drawing, ir'i which Figure 1 is a plan view, and Fig. 2 a side elevation of my set-works. Figs. 3 to 7 are deof various parts of the same, to be hereinafter described.

e A represents the frame-work of the movable carriage common to all saw-mills. Upon this carriage are firmly secured the two head-blocks G 0 represent the standards or brackets, placed one upon each head-block B, and resting and moving upon strips to a on the interior of the head-block, said strips forming guides or ways upon which the brackets are moved back and forth. The strips are adj ustable up and down, and held in place by means of set-screws b b, which passthrough vertical slots in the sides of the head-block, as shown in Fig. -Through each head-block B passes longitudinally a screw-shaft, D, having suitable bearings at each end of the head-block, and in each bracket 0 is a movable half-nut, E, representedin Fig 6, which, when dropped down, gears with the screw-shaft D, so that when said screw-shaft is turned the bracket is moved either back or forth. By the movement of the bracket back and forth the adjoining sliding surfaces will naturally wear more or less, and to compensate for this the guides or ways out are mad e movable, as above described, so that they can be raised at will and keep the joint tight, preventing the brackets from wab blin g. Upon the rear end of each screw-shaft D is a wheel, G, and the two wheels are connected by a belt, H, so that when one is turned .ing against the bottom the other is also, and thus the two screws are revolved simultaneously, so as to feed or move the two brackets O O exactly the same distance. The rear end of one of the screw-shafts D is passed through a sleeve, 4, formed upon a stirrup, I, attached to the end of the headblock, and the wheel G is placed on said shaft close up to the outer end of the sleeve, as shown in Fig. 5. On the sleeve d is placed a wheel, J, and outside of the same, also on the sleeve, is a rubber washer, e, and a metal collar, f, the rubber washer being held by the metal collar, and bearing against the hub of the wheel J. p The object ofthe rubber Washer is to produce sufficient friction to hold the wheel J in any position in which it may have been placed. The wheel J is graduated on its outer circumference, forming a dial, and. provided, at ninety degrees intervals, with projecting pins h h, head, as shown in Fig. 1. Along the circumference of the wheel G, on the inner side, at forty-five degrees intervals, are pins t 1', projecting inwardly over the graduated rim of the wheel J. The object of these attachments is that the operator may be enabled to set the log at the exact point where he may want it. In a full-sized machine one revolution of the wh eels G, and, consequently,of the screw-shafts D, is intended to move the brackets just one inch; and hence, by the use of the dial J and points '5, the operator can always move them as much or little as he may desire, in all cases making allowance for the thickness of the saw. One of the pins h on the dial J being headed, he can always tell, by using this at the starting-point, how far the desired thickness of board. The top or upper sides of the head-blocks B are also graduated, as shown in Fig. 1, to correspond exactly with the revolutions of the screw-shafts, each revolution showing upon the head-blocks that the brackets have been moved one inch, and so on. The front side of the vertical part of each bracket G has a dovetailed vertical groove for the reception of a correspondinglyshaped bar, K, which is, upon its front side, provided with a dog, L, and upon its rear or inner side with a spring, 70, said spring bearof the groove and holding the bar at any height it may be placed, preventing it from falling down of its own PATENT OFFICE.

one of which has a knob or to turn the wheel G to cut with a lever, T,

i the screws. Upon the shaft S, on the outside.

. chain, y,-passes to and around a pulleyflV, on

weight. These are used to dog the stock on the top, when placed on the head-blocks B B, against the brackets O C, by pushing the bars K Kdown tillthe dogsLLenter the stock. The bars are then held, each by a horizontal bolt, m, passing through thebracket near its upper end, and through a socket, n, attachedto the rear side of said bracket. The socket n is slotted diagonally or eccentrically, and a lever, 1), attached to the bolt 1p, passes through said slot, so that by turning said lever the bolt will be moved either outwardly to press against and hold the bar K, or inwardly to release the same. The lower side of the stock is dogged or held by dogs 1" 1', sliding in dovetailed grooves on arms M M attached to a shaft, N. The dogs 1" may be moved out or in as occasion may require, and are each held in its arm in the desired position by means of a set-screw, s, as shown in Fig. 7. The arms M M are attached at suitable intervals by setscrews to the shaft N, which rests in suitable hearings or binders t t, attached to a head or rest, 0, connecting the two brackets G O together. This shaft is, near one end, provided with a lever, P, which has a suitable projection to catch on a ratchet-bar, It, attached to one of the brackets, and thereby hold the shaft and dogs in the desired position.

The half-nuts E E, above mentioned, are held down on the screw shafts D D by means of springs '0 v, as shown in Fig. 2, and a shaft, S, passes through both of said nuts, attached to each end of the Upon this shaft, on the inner side of each nut, is an eccentric, to, so that by raising either one of the levers T the shaft will be turned and the eccentrics operate to raise the shaft and, consequently, lift the nuts up from shaft.

of each bracket O, is also placed a lever, V. These levers are, however, loose on the shaft, and their inner ends shaped eccentrically, so that by turning either of said'levers upward this end of the shaft will be raised only, lifting this nut up from the screw without disturbing the nut at the other end. This is especially advantageous when desired to cut lumber of unequal thickness. Near each end of the shaft S is a loose collar, w, from which a a shaft, X, situated at the rear end of the machine, under the head-blocks. On this shaft X is also a pulley, Y, from which a cord, 2, passes over an elevated pulley, Z, and attached to a weight, A. As the screw-shafts D D feed the brackets O Q forward the chains y 3 turn the shaft X so that the cord 2 will be wound upon the pulleyY, raising theweight A. Now, as soon as the nuts E E are lifted from the screws D D, the weight A" X the opposite direction, winding up the I will turn the shaft chains y g on the pulleys W, and draw the brackets back.

Hand-wheels B are attached, one. to each end of the shaft X, so as to turn the log back by hand; and a spring, a, may be arranged to act separately or in conjunction with the weight A for the same purpose.

The brackets O C may be stopped in their backward movement, at any point desired, by means of I two toothed bars, 0' O, pivoted one on the inner side of each head-block, and raised by means of arms D D on a shaft, E, projections b b on thebrackets striking against the toothed bars. Upon one end of the shaft E is a lever, G ,held at any point by aratched standard, H, so as to hold the arms D D at any point desired or necessary to sustain the toothed bars 0 at the required point to stop the brackets just at the required distance from the saw.

The bars 0 have a tooth for every two inches, to stop the brackets at any or even every inch.

The binders t t on the rest 0 effectually prevent the springing of the rest, which is often the case without them.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In head-blocks for saw-mills, adjustable guides or ways a a upon which the brackets move, said guides or ways being held by setscrews 1) b passing through slots in the headblocks, all substantially as and for the purposes herein set forth;

2. In combination with the screw-shafts D D and wheels G G connected by a belt, H, the dial J provided with pins h h and the points i "i, all constructed and arranged substantially as and for the purposesherein set forth.

3. The combination of the stirrup I provided with sleeve d, dial J, rubber washer e, and metal collar f, all substantially as and for the purposes herein set forth.

4. In combination with the bracket 0 and dog K L, the bolt m, eccentrically slotted socket n, and lever 19, all constructed and arrangedsubstantially as and for the purposes herein set forth.

5. The shaft S provided with levers T T, eccentrics w w, and loose eccentric levers V V, all constructed and arranged, as described, in combination with the nuts E E,sprin gs v c, screwshafts D D, and standards 0 O, substantially as and for the purposes herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 19th day of March, 1872.

NELSON J OHNSON.

Witnesses:

(J. L. Event, A. N. lVIARR. 

